vitess.io/vitess@v0.16.2/go/vt/vttablet/tabletserver/livequeryz.go (about)

     1  /*
     2  Copyright 2019 The Vitess Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package tabletserver
    18  
    19  import (
    20  	"encoding/json"
    21  	"fmt"
    22  	"net/http"
    23  	"strconv"
    24  	"text/template"
    25  
    26  	"vitess.io/vitess/go/acl"
    27  	"vitess.io/vitess/go/vt/log"
    28  	"vitess.io/vitess/go/vt/logz"
    29  )
    30  
    31  var (
    32  	livequeryzHeader = []byte(`<thead>
    33  		<tr>
    34  			<th>Type</th>
    35  			<th>Query</th>
    36  			<th>Context</th>
    37  			<th>Duration</th>
    38  			<th>Start</th>
    39  			<th>ConnectionID</th>
    40  			<th>Terminate</th>
    41  		</tr>
    42          </thead>
    43  	`)
    44  	livequeryzTmpl = template.Must(template.New("example").Parse(`
    45  		<tr>
    46  			<td>{{.Type}}</td>
    47  			<td>{{.Query}}</td>
    48  			<td>{{.ContextHTML}}</td>
    49  			<td>{{.Duration}}</td>
    50  			<td>{{.Start}}</td>
    51  			<td>{{.ConnID}}</td>
    52  			<td><a href='terminate?connID={{.ConnID}}'>Terminate</a></td>
    53  		</tr>
    54  	`))
    55  )
    56  
    57  func livequeryzHandler(queryLists []*QueryList, w http.ResponseWriter, r *http.Request) {
    58  	if err := acl.CheckAccessHTTP(r, acl.DEBUGGING); err != nil {
    59  		acl.SendError(w, err)
    60  		return
    61  	}
    62  	var rows []QueryDetailzRow
    63  	for _, ql := range queryLists {
    64  		rows = ql.AppendQueryzRows(rows)
    65  	}
    66  	if err := r.ParseForm(); err != nil {
    67  		http.Error(w, fmt.Sprintf("cannot parse form: %s", err), http.StatusInternalServerError)
    68  		return
    69  	}
    70  	format := r.FormValue("format")
    71  	if format == "json" {
    72  		js, err := json.Marshal(rows)
    73  		if err != nil {
    74  			http.Error(w, err.Error(), http.StatusInternalServerError)
    75  			return
    76  		}
    77  		w.Header().Set("Content-Type", "application/json")
    78  		w.Write(js)
    79  		return
    80  	}
    81  	logz.StartHTMLTable(w)
    82  	defer logz.EndHTMLTable(w)
    83  	w.Write(livequeryzHeader)
    84  	for i := range rows {
    85  		if err := livequeryzTmpl.Execute(w, rows[i]); err != nil {
    86  			log.Errorf("livequeryz: couldn't execute template: %v", err)
    87  		}
    88  	}
    89  }
    90  
    91  func livequeryzTerminateHandler(queryLists []*QueryList, w http.ResponseWriter, r *http.Request) {
    92  	if err := acl.CheckAccessHTTP(r, acl.ADMIN); err != nil {
    93  		acl.SendError(w, err)
    94  		return
    95  	}
    96  	if err := r.ParseForm(); err != nil {
    97  		http.Error(w, fmt.Sprintf("cannot parse form: %s", err), http.StatusInternalServerError)
    98  		return
    99  	}
   100  	connID := r.FormValue("connID")
   101  	c, err := strconv.Atoi(connID)
   102  	if err != nil {
   103  		http.Error(w, "invalid connID", http.StatusInternalServerError)
   104  		return
   105  	}
   106  	for _, ql := range queryLists {
   107  		if ql.Terminate(int64(c)) {
   108  			break
   109  		}
   110  	}
   111  	livequeryzHandler(queryLists, w, r)
   112  }